Hot-blast system.



A. s. HANSON.

HOT BLAST SYSTEM.

APPLICATION FILED DEG. I 1913.

I 1 ,,0 Patented M15, 1915.

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WITNESSES IMVEAITOR 7"? waif/j fla/wo/z Q. 3mm By ATTORNEYS A. S. HANSON.

HOT BLAST SYSTEM.

APPLICATION FILED DE(J.1, 191s.

Patented J an. 5, 1915.

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MTORIVEVS Patented Jan. 5, 1915. s s'HEETsHsHEBT a.

A. S. HANSON.

HOT BLAST SYSTEM. APPLICATION FILED DEC. 1, 1913. 1 1 3,5 M

WITH/E8858 9mm I ALBERT S. HANSON, 01E BIIlLILIlll'tIi-S, MONTANA;

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Taall whom it may concern:

Be it known that I, ALBERT S; HANSON, a

citizen of the United States, and a resident 1 of Billings, in the county of Yellowstone and State of Montana, have invented a new and useful Improvement in Hot-Blast Systems, of which the following is a specification.

My invention is an improvement in hot blast systems, and has for its object to provide a system of the character specified, for insuring a more complete combustion of fuel in furnaces, engines, steam boilers, or

in any other place where a large amount of heat is required.

In the drawings: Figure 1 is a front elevation of a furnace for utilizing the system, Fig. 2 is an enlarged partialtop plan view of Fig. 1, Figs. 3, 4 and 5 are sections on the lines 3 3, 44 and 55, respectively, of Fig. 1, and Fig. 6 is a section on the line 6-6 of Fig. 5, looking in the direction of the arrows.

In the drawings is shown a metal casing 1 of' substantially rectangular form and of suitable dimensions, and the case is provided in its rear wall with an inlet pipe 2 at its top, and with an outlet pipe 3 ntermediate its ends. In the front of the casing, an opening is provided for removing ashes from the ash pit 4, and a door 5 is provided for closing the opening, the door being hinged at 6 to the casing and having latch mechanism 7 for holding it in closed position.

- The ate is arranged above the door, and the sai grate'is supported by ribs-8,9 and 10, respectively, on the inner wall of the casing. A shaft 11 is journaled transversely of the casing, in'bearings 12 in the casing wall, and the front end of the shaft extends beyond the front wall of the casing, and is provided with a crank arm 13.

Gear wheels 14 are secured to the shaft near its ends, and the said wheels mesh with series of teeth 15 on the'side bars 16 of a frame to be presently described. The. said frame consists of the side bars 16 and end bars 17 connecting-the side bars, and other bars 18 are arranged longitudinally of the frame between the bars'l6. The frame is mounted'to reciprocate between the ribs 8 and}? of the casingiand each of'the bars 18 is Providedwith" a longitudinally "messing less than that-of the bars 18. Front an rear partition walls 21 and 22 are arranged Within the casing, the said walls extending from one side wall to the other, and at their upper ends the partitions are connected by a cross wall 23, the said wall Patented tram. a, ate. Application filed December 1, 1913. Seriai to. 803,969.

being horizontal and parallel with" the top of the casing 1.

The partition walls 21 and 22 do not extend to the top, but to a point just'below thein1et'2, and the lower end of the partition' wall 21 extends to approximately the under side of the outlet pipe 3. An opening 24 is provided at the lower end of the wall 21, and the front wall of the casing 1 is offset inwardly below the said opening as shown at 1, and a web 25 connects the front wall of the casing 1 with the in wardly offset portion, the said web extending inwardly beyond the portion 1, as shown in Fig. 5.

Below the opening 24 and below the outlet 3, the casing 1 is lined with fire brick or fire backs as indicated at 26, the said bricks or backs resting upon the ribs 8. Just above the opening 25 a block 27 of approximately triangular cross section is arranged, the said block being secured to the inner face of the partition wall 21 just above the opening 2 1, and the said block extends the full width of the casing.

In cross section, the block is right triangular and the face representing the hypotenuse of the block is superposed on the partition wall 21... A series of fingers 28 is arranged between the block and the portion 1 of the wall, the said fingers being curved or arched and arranged with their convex'surface inwardly. Each of the fingers has one of its ends connected with the free corner of the block, and the other end bears against the inner face of the adjacent fire back. Another series of fingers 29 depends in front of the-outlet 3, the said fingers being secured at their upper ends to a transverse rib 30' on 32, arranged transversely and diametrically of the inlet 2, and the said damper may be arranged as shown in Fig. 5, or may be arranged transversely of the inlet to cut off the communication to the same.

A series of fans is arranged at the junction of the passage 64 between the partition wall 23 and the top of the casing, and

the passage 64 between the partition wall 21 and the front of the casing. Shafts 36, 36

and 36 extend transversely through the front wall of the casing, the said shafts be-- ing journaled in bearings in the arms of brackets 33. Each shaft is supported by two bearings, and the bracket'is secured to the front wall of the casing, one of the arms of the bracket resting against the wall and the other being offset laterally outward from the wall. Y

A fan is secured to each shaft, and each fan is composed of aring 34 and a disk 35. Each of the disks 35 is arranged with its concave face adjacent. to the wall 1, and each disk .is provided with a central hub 37 on its concave face. The hubs 37 of the fans are secured to the shafts, and each of the said disks is provided on its convex face with a facing 33 of non-heat conducting and non-combustible material, as for instance asbestos or the like. The ring 34 of each fan is arranged in spaced relation with respect to the disk, and is connected to the disk by vanes or blades 37*. The vanes or blades of each fan arearranged near the periphery of the disk, asshown in Figs. 5

and 6,' in such manner that the central por-.

tion of the, fan on the convex face of the disk is open and unobstructed. The facing 35 prevents heating of the disks 35 and of the shaft of the fans, and each set of blades or vanes, ring, disk and hub constitutes a fan. The fans are operatedin a manner to be presently described.

The blades or vanes 37 are corrugated, and each is curved longitudinally and transverse to the fan, and all of the blades or vanes are arranged with their convex faces in the same direction. While the fans above described are preferably used, it is obvious that any form of fan might be used instead. A sprocket wheel 41 is secured to the shaft 36 of the central fan, and a sprocket chain 42 connects the said wheel with a suitable source of power, not shown.

Sprocket wheels 41 and 41 are secured to the shafts 36 and 36 respectively, and each of the said wheels is connected to the central shaft 36, by means of a sprocket 'chain 42 and 42 respectively. The chain 42 engages a sprocket wheel 43, and the chain 42 engages a similar wheel 44 on the shaft 36. Thus the lateral shafts are driven from the central shaft by means of the sprocket chains 42? and 42 A gear wheel 45 is secured to the central shaft 36, and the said wheel meshes with a pinion 46 on a stub shaft 47, extending laterally from a plate 48 on the outer face of the casing wall. A gear wheel 49 is secured to the shaft 47 and the said wheel meshes with a pinion 50 on another stub shaft 51, con nected with the plate 48. A disk 52 is journaled on the shaft 51, and a wrist pin 53 is arranged eccentrically on the said disk.

The arm 13 before mentioned, on the shaft 10, is connected by means of a link 54 with the wrist pin 53, before mentioned. Thus through the gear wheels 45 and 49 and pinions 46 and 50 the link 54 is reciprocated. The said gear wheels and pimons constitute a reducing train of gears for oscillating the shaft 10.

The wrist pin 53 is adjustably connected with the disk 52 as shown in Fig. 3, to permit the throw of the arm 13 to be varied. The wrist pin is mounted in a radial slot 55 inthe disk, the slot being enlarged at the inner face of the disk as shown at 56 to receive the head 57 of the wrist pin. A nut- 58 is threaded on to the wrist pin after it passes through the. link 54 to hold the bar in place.

It will be obvious that by loosening the nut the wrist pin may be moved radiall with respect to the shaft 51. The shafts 4 and 51'are mounted in bearin sleeves 59, connected with the plate 48, efore mentioned. A feed opening 60 is provided in the end wall of the casing 1, just below the partition 23, and a door 61 is hinged to the casing wall, and is provided with latch mechanism 62 for holding the door closed. A peep hole 63 is provided inone of the side walls of the casing, the said peep hole having a transparent covering.

The operation of the improved system is as follows :The fire is started in the usual manner, the door 5 being opened if desired, to permit the initial draft. During the thorough igniting of the fuel, the draft is by way of the door 5, through the fuel on the grate and by way of the pipe 3 to the chimney or flue. After the fuel has been thoroughly ignited, the door 5 is closed and the fans are set in motion, the draft damper 31 being placed to supply the required amount of draft. The air now enters through the inlet 2, being drawn in by the fans and forced downwardly through the space 64 between the partition wallQl and the adj acent wall of the casing 1 to the opening 24. The air passes through the opening 24 and through the flame from the burning fuel, a

'portion passing out at the outlet 3, while another portion passes upwardly through the passage 65 between the partition wall 22 and the adjacent wall of the outer casing to again make the circuit, just described.

It will be noted that there is an-extension 66 just above the opening 67, through which hit oscillated wholly, thus reciprocating matte tion wall 21, as shown at 68, to, deflect the air entering from the passa e 64 upwardly above the level of thefue? on the grate. The ashes and cinders may be removed through the door 5, and the fuel is fed to the grate through the door opening 60. By regulating the damper 31, the amount of air entering through the inlet 2 may be varied, and it will be evident that the less air entering through the pipe 2, the more gases will be drawn upwardly through the passage 65.

In the ordinary furnace, a very large amount of unconsumed fuel is thrown out by way of the stack in the form of smoke. With the present construction, this fuel in gaseous form is passed through the hottest portion of the flame to be entirely consumed.

The casing 1 may be of any desired size,.

depending upon conditions to be met, and it will be understood that any form of fan may be used, the number of fans depending upon the relative width of the space between the top of the casing l and the partition wall 23.

i The fingers 28 and 29 reventthe passage of solid material, and a so act as deflectors for preventing the passage of sparks. It will be noticed that the lower end of the fingers of the series 29 are offset laterally toward the adjacent wall of the casing 1, so that the said lower ends are below the extension 66.

The improved system is especially intended for use on railroad engines, and the fans may be driven from any moving part of the engine. When the improved system is designed to heat a boiler or the like, the hot air for heating the boiler passes through the outlet 3. An opening is provided in one wall of the casing, in order to permit the fire to be drawn when this is desirable for any reason. The outer wall may be water jacketed if desired, and changes in construction may be made in accordance with conditions under which the improved system is to be used. The fuel chamber, that is, the space between the partition walls 21-22 and the ends of the casinglmay be kept filled with fuel, and the block 27 and the ledge 30 together with the fingers 29, slow the feed of the fuel to the proper supply. As the fuel burns away, other fuel passes downwardly from the fuel chamber to supply the place of that consumed.

It will be noticed from an inspection of vFig. 5that abaflle plate 71' is"arranged' transversely of-the passage 64 at the junc tion of the said passage with the'p'assage 64 in such manner that the communicationbetween the two passages is by way of the fans. The baffle plate closes the communication between the passages except that through the fans.

A"door 70 is'provided in the ofiset porreason. The fans are cased in so that air mustenter from the rear, and leave them at the1r lower sides.

The fingers 29 are curved toward the rear wall of the furnace to engage the said wall below the hot air outlet, and the fingers 28 are similarly curved to engage the front wall below the passage 24. These fingers 28 and 29 with water jacketed casings would be pipes, and would be connected with the jacket to permit water to circulate through the said fingers to prevent over-heating.

The disk 52 to which the link 54 is connected is loose on the shaft 51, and the gear wheel 50 on the same shaft is feathered on the shaft 'as indicated at 73, and is capable of movement longitudinally of the shaft, toward and from the disk, to cause the said tion 1 of the front wall, to permit the with- 'drawal" of the fire when desired for any gear wheel 50 to engage with the gear wheel be moved out of mesh with the gear wheel 49, and unclutched from the disk 52.

The lever 74: is pivoted to a bracket 7 5 eX- tending outwardly from the front of the casing, and the bracket is provided at its outer end with a toothed segment 76, for

cooperation with latch mechanism'77 on the lever, for holding the lever in adjusted position. The lower end of the lever is forked and engages an annular groove in the hub of the gear wheel 50. By means of the lever the gear wheel may be released from the gear wheel 49, and from the disk 52, in order to stop the operation of the shaking mechanism for the grate.

' I claim 1. A device of the character specified, comprising a casing having an air inlet in its rear wall at the top of the casing, and an air outlet in its rear wall intermediate the ends of the casing, a grate arranged transversely of the casing below the out let and mounted to reciprocate in the plane of the grate, said grate comprising spaced bars and a series of upstanding stirring fingers on each bar, a partition wall arranged transversely of the casing near the mately the inlet to the outlet, a partition arranged transversely of the casing-near the front wall, a connection between the partitions at their upper ends, a front wall of the easwall to form an opening, a series of fans arranged near the front wall of the casing above the last-named partition, a connection between the'fans for constraining them to rotate together, means for rotating one of the fans, means for reciprocating the grate, a connection between the fans and the reciprocating means for operating the same when the. fans are rotated, and a damper in the inlet at the top of the casing, said casing having a feed opening below the connection between the upper ends of the artitions, and a door for closing the openmg.

A device of the character specified, comprising a casing having an air inlet in its rear wall at the top of the casing, and an air outlet in its rear wall intermediate the ends of the casing, a grate arranged transversely ofthe casing below the outlet and mounted to reciprocate in the plane of the grate, a partition wall arranged transversely of the casing near the rear wall thereof and extending from the inlet to the outlet, a partition arranged transversely of the easing near the front wall, a connection between the partitions at their upper ends, the front wall of the casing being offset inwardly below the lower end of the lastnamed partition to approximately the plane of the said partition, the'lower end of the said partition being spaced above the inwardly oflset portion of the wall to form an opening, a series of fans arranged near I the front wall of the casing above the'lastnamed partition, a connection between the fans for constraming them to rotate together, means for rotating one of the fans,

means for reciprocating the grate, a connection between the fans and the reciprocating means for operating the same when the wall between-the inlet and the outlet, said casing having a passage leading from the said partition wall adjacent to the top of thecasing and to the rear wall thereof and communicating with the body of thecasing at approximately the level of the outlet, saidpassage extending the full width of the casing, the casing having a feed opening below the said passage, a grate arranged transversely of the casing below the outlet, said grate being mounted to reciprocate transversely of the casing in the plane of the g ate and having stirring fingers extendin upwardly from the upper face thereo means for drawing air through the inlet and delivering it to the casing through the passage, and a connection between the said means and the grate for reciprocating the grate.

4. A device of the character specified, comprising a casing having in its rear wall an inlet at the top of the casing and an outlet intermediate the ends of the casing and having a partition arranged transversely of 'the casing and spaced apart from the rear wall between the inlet and the outlet, said casing having a passage leading from the said partition wall adjacent to the top of the casing and to the rear wall thereof and. communicating with the body of the casing at approximately the level of the outlet, said passage extending the full width of the casing, the casing having a feed opening below the said. passage, a grate arranged transversely of the casing below the outlet, said grate being mounted to reciprocate transversely of the casing in the plane of the grate, means for drawing air through the inlet and delivering it to the casing through the passage,and a connection between the said means and the grate for reciprocating the grate, and a damper for controlling the draft through the inlet.

5. A device of the character specified, comprising a casing having in its rear wall an inlet at the top of the casing and an outlet intermediate the ends of the casing and having a partition arranged transversely of the casing and spaced apart from the rear wall between the inlet and the outlet, said casing having a passage leading from the said partition wall adjacent to the top of the casing and to the rear wall thereof and communicating with the body'of the casing at approximately the level of the outlet, said passage extending the full width of the casing, the casing having a feed opening below the said passage, a grate arranged transversely of the casing below the outlet, said grate being mounted to reciprocate transversely of the casing in the plane of the grate, means for drawing air through the inlet and delivering it to the casing through the passage, and a connection between the said means and the grate for reciprocating the grate.

6. A device of the character specified, comprising a casing having in its rear wall an inlet at the top of the casing and an outlet intermediate the ends of the casing and having a partition arranged transversely of the casing and spaced apart from the rear wall between the inlet and the outlet, said casing niaatae having a passage leading from the said partition wall adjacent to the top of the casing and to the rear wall thereof and communicating with the body of the casing at approximately the level of the outlet, said passage extending the full width of the casing, the casing having a feed opening below the said passage, a grate arranged transversely of the casing below the outlet, and means for drawing air through the inlet and deliverit to the casing through the passage.

A device of the character specified, comprising a casing having in its rear wall an inlet and an outlet, the outlet being at the top of the casing and the inlet being intermediate the ends of the casing, a grate arranged transversely of the casing below the outlet, said casing having a passage leading from above the outlet to the top of the easing and extending forwardly at the top of the casing to the front thereof, and then extend ing downwardly at the front of the casing and delivering'to the casing opposite the outlet, the inlet communicating with the passage, means for creating a draft of air through the inlet and the passage, and screens ar ranged transversely of the casing, one of the said screens being at the outlet of the passage, and the other being at the outlet of the casing and at the inlet of the passage.

8. device of the character specified, comprising a casing having in its rear wall an inlet and an outlet, the inlet being at the top of the casing, and the outlet being intermediate the ends of the casing, a grate arranged transversely of the casing below the outlet, said casing having a passage leading from above the outlet and deliveringopposite the said outlet, the inlet of the casing communicating with the passage, and means for creating a draft of air through the passage.

9. A device of the character specified,co1nprising a casin having in its rear wall an inlet and an out ct, the inlet being at the top of the casing, and the outlet being intermediate the ends of the casing. a grate arranged transversely of the casing below the outlet, said casing having a passage leading from above the outlet and delivering opposite the said outlet, the inlet of the casing communicating with the passage, and means for creating a draft of air through the passage, the casing having a deflector arranged transversel o the outlet of the casing and the inlet 0 the passage.

10. A device of the c h gracter sp e cified,

comprising a casing having in one wall an inlet and an outlet, a grate arranged transversely of the casing near the bottom thereof, the inlet being near the top of the casing means for creating a forced draft through the passage from the inlet thereof, the inlet of the first-named wall openin into the said passage, andra damper contrd lling the said first-named inlet.

11. A device of the character specified, comprising a casing having in one wall an inlet and an outlet, a grate arranged transversely of the casing near the bottom thereof, the inlet being near the top of the casing and the outlet above the grate, said casing having a passage extending upwardly alongside the wall provided with the inlet and the outlet, and thence along the top of the easing and down alongside the opposite wall from the first-named wall and delivering above the level of the burning fuel on the grate and below the outlet, the inlet of the said passage being just above the outlet, and means for creating a forced draft through the passage from the inlet thereof, the inlet of the first-named wall opening into the said passage.

12. A device of the character specified, comprising a casing, a grate arranged transversely of the casing near the lower end thereof, said casing having an outlet above the grate in its rear wall and having a passage leading from above the outlet to the top of the casing along the rear wall thereof, and the front of the casing at the top thereof and thence downwardly along the front wall of the casing to a point below the outlet, the grate being mounted for reciprocation transversely of the casing, means for creating a draft through the passage and delivering to the casing opposite the outlet,

and a connection between the said means.

and the grating reciprocating means for operating the same.

ALBERT S. HANSON. Witnesses:

C. R. 11mm, 

